个人制作牛津版高中英语模块第单元词汇复习篇单元测试篇包括单词短语总结以及单元测试卷修订稿

个人制作牛津版高中英语模块第单元词汇复习篇单元测试篇包括单词短语总结以及单元测试

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集团标准化工作小组 [Q8QX9QT-X8QQB8Q8-NQ8QJ8-M8QMN]

M o d u l e4U n i t3T o m o r r o w’s w o r l d

一．词汇复习篇：

【单词】

1. Upon reaching the top of the mountain, a feeling of happiness and a

sense of achievement will be experienced. 到达顶峰时，观众心中将会涌起一种愉悦感和成就感。

on / upon + doing 一…就…（用以表示某一特定场合）

On entering the room, she saw him. 她一进这个房间便看到了他。

【拓展】

◆in + doing 做…时，…发生时，当…时

In attempting to save the child from drowning, she nearly lost her life.

◆ after + doing 在…后

After winning the prize she became famous overnight.

◆ before + doing 在…之前

Before going home, I must finish this letter.

2. To add to the virtual world of ReadlCine, smells are given out through

small openings in the headsets.

add to 增加，加到

Fireworks added to the attraction of the festival night. 焰火使节

日的夜晚更加生色。

【拓展】add … to …把…加到…

add up 加起来

add up to 总计共达

3. be delivered into the viewer’s mouth 输送到观众的嘴里

deliver the mail 投递邮件

deliver the criminal to the police 把罪犯交给警察

deliver a lecture 发表演讲

She delivered a baby boy this morning. 今天早晨她生了个小男孩。

4. thrill vt.使激动；使颤动、战栗；使毛骨悚然

vi.激动, 心怦怦地跳；发抖, 颤动(with)

Stories of adventure thrilled him. 冒险小说使他激动。

thrill with joy 为喜悦所激动We thrilled at the good news. 听到那好消息我们感到

很兴奋。

5. However, before using it in my next film, there are some points I would like to mention.

mention vt. & n. 提及，说起；说到，讲到；写到；记载

Did you mention this to my sister 你对我姐姐说到这件事了吗

The soldier was mentioned in a report for his bravery.

这个战士的勇敢行为被记载在报告书里。

No mention was made of her illness. 关于她的病情没有提到过。【拓展】as mentioned above 如上所述

Don’t mention it.不要客气，不用谢，没关系，不要紧（作客套语）

not to mention = without mentioning 更不必说，更谈不上

(not) worth mentioning （不）值得一提

at the mention of 在（听人）提到…时

make mention of 提到…，说到…

6. I’m worried that Realcine may be too expensive for ordinary people to afford.

afford vt.买得起；负担得起；能提供，能给予；抽得出（时间）

afford常与can，could，be able to 连用

not able to / cannot afford a new car 买不起新车

a tree that affords ample shade 可以遮荫的树

He is too busy to afford a holiday. 他忙得抽不出时间度假。

I can’t afford an hour for lunch我抽不出一小时吃午饭

7. It has been suggested that travel sickness can be reduced by using VR. suggest vt.建议，提出；使想起，暗示；使联想到

suggest things for children to do 建议孩子们做一些事

He suggested going out for a walk. 他建议出去走走。

He suggested that we (should) take a walk. 他提议我们去散步。

That girl’s sun-tanned face suggests excellent health / (that) she is in good heath.

那个姑娘被太阳晒黑了的脸表明她身体非常健康。

The thought of summer suggests swimming. 想到夏天，就使人联想到游泳。

8. I believe our painting is worth quite a lot of money.

worth adj.等值的；值得的

What / How much is it worth 这值多少钱

It is worth ￡500. 它值五百镑。

That second-hand car isn’t worth what you paid. 那辆旧车不值你所花的钱。

a proposal not worth consideration 不值得考虑的提案

It’s worth seeing / hearing / reading. 值得一看/一听/一读。

【拓展】worthy有价值的；有意义的；配得上的；可尊敬的；值得…的

His acts are worthy of praise / being praised / to be praised. 他的行为值得表扬。

9. It seems that people prefer living in flat.

prefer vt.更喜欢，宁愿

prefer coffee to tea 喜欢咖啡胜于茶

prefer doing to talking = prefer to do rather than talk 喜欢做而不喜欢说

I should prefer you not to stay / that you did not stay there too long.

我希望你不要在那儿呆得太久。

Do you prefer coffee or tea 你喜欢咖啡还是茶

10. After this, with the help of force from a black hole, they are able to

guide the lost spaceship safely back to the Earth.

guide vt.带领，指导，支配，管理,

guide a ship through a channel 引领轮船通过海峡

guide me to my seat 带我到我的座位上去

【短语】

1. come true 实现，成真

2. in other ways 在其他方面

3. pass sth on to sb 把…传递/留给某人

4. be connected to 和…相连接

be connected with 和…有联系，有关系5. give out 分发；发出（气味等）；用尽，精疲力竭

6. put sth forward 提出，推举出

7. in reality 实际上，事实上 in actual fact 事实上，其实

as a matter of fact 事实上；实际上；不瞒你说，确实

in nature 实际上, 本质上in practice 实际上；在实践中；熟练

8. bring history alive 复现历史

9. be impressed by / at / with 被深深打动/感动

10. leave me with a deep impression 给我留下深刻的印象

make an impression on sb 给某人留下印象make no impression on 对…无影响/效果

11. experience the sense of achievement 体验成就感

experience the world 领略世界

12. make a profit 获利

13. end in 以…为结果，以…告终，

end up with 以…结束

14. win the admiration of sb 赢得某人的钦佩/赞美

15. keep in touch with sb 和某人保持联系

get in touch with sb 与某人取得联系

16. at the moment 此刻；(正当)那时

17. last but not least 最后但同样重要的

18. be on display = be on show 被展出，被展览

19. be of great benefit to people 对人们非常有益/有好处

20. in this way 这样

21. be fascinated by 对…着迷/入迷

22. be situated in / on 位于，坐落于

23. accuse sb of sth 因某事控告某人

24. close down 关闭，封闭；停止播音

25. voice my opinions 发表我的意见

26. at one time 同时，曾经

27. fall off the bookshelf 从书架上掉下来

28. carry out a survey on students’ opinions 对学生的意见进行一次调查

29. prepare sb for the future 让某人为将来做准备

30. come across 偶遇，不期而遇

31. be widely recognized as 被广泛地认可为…

32. be trapped in a lost spaceship 被困于一艘失控的宇宙飞船上

二．单元试题篇：

译林牛津版英语M 4 Unit 3 Tomorrow’s world试题

第一部分: 听力（略）

第二部分英语知识运用(共两节；满分35分)

第一节单项选择(共15小题；每小题1分,满分15分)

请认真阅读下面各题,从题中所给的A、B、C、D四个选项中,选出可以填入空白处的最佳选

项,并在答题卡上将该项涂黑。

21．(2013·江苏徐州模拟)—What is your plan after leaving ________ school

—I'll do whatever is useful to ________ society.

A．/; the B．the; the

C．/; / D．the; /

22．(2013·无锡高三检测)What a beautiful sight! Wild flowers of different colors spread all over the hills and around the lake, ________ to the beauty of the valley.

A．to add B．being added

C．adding D．added

23．(2013·苏南三校联考)—What are the workers talking about —They are discussing the idea the old worker ________ at the meeting yesterday.

A．put forward B．came up

C．set off D．brought out

24．(2012·蚌埠模拟)—How do you like your college life —Terrible. Not only ________ less spare time, but ________ myself even busier than before.

A．do I enjoy; do I find B．I enjoy; I find

C．do I enjoy; I find D．I enjoy; do I find

25．It is high time we ________ some effective measures to solve the job problem.

A．will take B．have taken

C．had taken D．took

26．(2012·漳州高三检测)What a ________ to get into the peaceful

and quiet country especially when one has been fed up with the noise of the city.

A．challenge B．convenience

C．freedom D．treat

27．(2013·姜堰模拟)________ in the leg made it impossible for me to walk as fast as usual.

A．Being injured B．Injuring

C．Having injured D．Injured

28．(2013·南京四校联考)Mr. Smith found that gas ________ from the pipe when he came back because we forget to switch off. But at last we were lucky to escape ________.

A．escaped; being punished

B．was escaping; being punished

C．escaped; punishment

D．was escaping; punishing

29．Liang Bo, winner of the Voice of China, has been nicknamed “Little Wang Feng”， but ________ seems that it is not a title he enjoys.

A．this B．it

C．one D．he

30．________ at his failure in the test, John wouldn't like to pick up the topic for the moment.

A．To be disappointed B．Disappointing

C．Disappointed D．Having disappointed

31．She's got the job because she has the advantage ______

others of knowing many languages.

A．over B．above

C．against D．beyond

32．(2013·合肥质检)His neighbor ________ him of playing the musical instrument too loudly, for which he had to apologize.

A．accused B．charged

C．scolded D．blamed

33．The cinema looks very old because of its traditional design. ________， it was finished only two months ago.

A．In reality B．In turn

C．In return D．In need

34．(2013·长沙高三模拟)At a construction site in our city the workers have uncovered an ancient wall that ______ to keep enemy out of the city, but it requires further evidence.

A．might have functioned B．would have functioned

C．must have functioned D．should have functioned 35．(2011·陕西高考)—Jack, you seem in high spirits.

—______We won the match 4 － 0.

A．Guess what B．So what

C．No wonder. D．No doubt.

第二节完形填空(共20小题；每小题1分,满分20分)

请认真阅读下面短文,从短文后各题所给的A、B、C、D四个选项中,选出最佳选项,并在答题卡上将该项涂黑。

Can you imagine becoming the richest person in the world and then giving your money away That’s exactly what Andrew Carnegie 36 . Carnegie had a number of different careers; he was an industrialist and a businessman and he made a lot of money. He believed that 37 people were morally obligated (有责任的) to give their 38 back to others in society. So after retirement in 1901, the world’s 39 man decided to become a philanthropist (慈善家), a person who gives money to good 40 . 41 Carnegie had made

some charitable donations before 1901, he really made giving away money his new 42

after retirement. In 1902 he founded the Carnegie Institution to fund scientific research and 43 a pension fund (退休基金) for teachers with a $10 million donation. Throughout his life, Andrew Carnegie loved to read. As a result, it made 44 that he wanted to give money to 45 education and reading. When Carnegie was a young man he

lived near Anderson, a rich man who 46 any working boy to use his 47 library for free. In those days, America 48 had a system of free public libraries and poor people

usually had nowhere to find books to read. Carnegie never forgot Anderson’s 49 ; so

he gave money to towns and cities to establish more than 2,000 public 50 . He also gave $125 million to a foundation called the Carnegie Corporation (卡耐基社团法人) to 51 colleges and other schools. World peace was another cause Carnegie 52 . He established the Carnegie Endowment (基金) for international peace and funded the building of the Hague Palace of Peace, which 53 the World Court with houses, in the Netherlands. By 1911, Carnegie had 54 a huge amount of money —90 percent of his 55 . Today, Carnegie has a world-wide reputation, both for his success in his business and in his contributions to charity.

36. A. admired B. promised C. said

D. did

37. A. wealthy B. sincere C. educated

D. considerate

38. A. business B. experience C. wisdom D. money

39. A. richest B. purest C. poorest D. smartest

40. A. expectations B. causes C. reputations

D. decisions

41. A. Until B. Though C. Since

D. Because

42. A. hobby B. hope C. life

D. career

43. A. discovered B. established C. applied

D. awarded

44. A. fun B. success C. sense

D. effect

45. A. support B. continue C. raise

D. Extend

46. A. allowed B. supposed C. followed D. praised

47. A. public B. personal C. secret

D. main

48. A. rarely B. nearly C. usually D. really

49. A. enthusiasm B. generosity C. courage D. Energy

50. A. libraries B. schools C. hospitals D. Academies

51. A. buy B. aid C. assess

D. Choose

52. A. burst in B. took on C. relied on D. called in

53. A. handled B. provided C. pleased D. dealt

54. A. collected B. donated C. invested D. wasted

55. A. strength B. opportunities C. efforts D. fortune

第三部分阅读理解(共15小题；每小题2分,满分30分)

请认真阅读下列短文,从短文后所给的A、B、C、D四个选项中,选出最佳选项,并在答题卡上将该项涂黑。

A

It is reported that the Ebola virus has returned to Africa. The virus causes a disease called Ebola hemorrhagic (出血的) fever. The Ebola virus affects animals and people. It killed more than 200 people in the former Zaire in 1995. This year, the Ebola virus has killed more than 150 people in Uganda.

The Ebola virus kills so quickly that the body’s defense system has no time to act against it. The disease kills fifty to ninety percent of the people it infects (感染). The disease begins with high body temperature, severe headache and muscle hurting. Then it causes severe bleeding and organ failure. Then the victim dies. Doctors say a person with the Ebola virus usually dies within three weeks after becoming infected. The disease spreads by people touching the body fluids of an infected person.

No medicine or treatment now exists for the disease. Recently, however, American researchers announced progress in developing a medicine to prevent Ebola hemorrhagic fever in monkeys. The scientists gave eight monkeys a small but deadly amount of the Ebola virus. They gave an experimental vaccine (疫苗) to only four of them. The monkeys that did not receive the vaccine died within a week. The vaccine prevented the disease from developing in the four monkeys that received it. All the four monkeys were healthy six months later.

The researchers said this was the first time a vaccine had protected animals similar to humans from the deadly Ebola virus. They will continue to test the vaccine on animals by giving them increasingly strong amounts of the virus.

56. The first symptom of Ebola hemorrhagic fever is ______.

A. high body temperature

B. serious bleeding

C. severe body hurting

D. organ failure

57. The Ebola virus can cause death quickly mainly because _________.

A. it causes a great deal of suffering

B. it causes people to lose much blood

C. the body’s defense system hasn’t time to act against it

D. it can easily produce viruses in people’s bodies

58. From the passage we can learn that _________.

A. the Ebola virus was originally found in Africa

B. progress in finding a vaccine to prevent the Ebola virus has been made

C. monkeys can be infected by the Ebola virus through air

D. people infected with the Ebola virus always die immediately after being infected

59. Which of the following statements is TRUE according to the passage

A. Monkeys are similar to humans in how a vaccine affects them.

B. The researchers directly tested the vaccine on people.

C. Half of all moneys injected with the vaccine died six months later.

D. The researchers gave the monkeys a large amount of the Ebola virus.

B

It’s hard to find a star shining brighter in Nashville than Kenny Chesney. Since he took off 15 years ago, this country musician has sold more than 25 million albums, has had sixteen No. 1 hits, won countless awards and had a sea of loyal fans who have made him the biggest North American concert-ticket seller.

Kenny is certainly at the height of his career as he releases his Greatest Hits

II album this week. It’s a collection of songs in which he says each takes him to a different place or event in his life. The most personal is the song I’m Alive, Kenny tells The Boot. "Most of the songs on this record are really fun, but I wrote I’m Alive after my breakup with Renee. I woke up one day and realized, even though I had gone through this and didn’t feel good about it, my life still belongs to me. I’m alive; I get to make music; I’ve got a lot of great friends. That’s the message of the song."

Kenny insists that the song selection for Greatest Hits II is not formulaic(刻板的). In addition to the hits that climbed the country charts, the singer also wanted to include some songs unknown to his fans that reflected his life and career path. "I didn’t want it to be all hits; I wanted it to be a second c hapter of my life in music," he explains. "So the song Beas You Are really does that for me."

Kenny recently celebrated his 41st birthday, but the number of candles on the cake didn’t depress him a bit, thanks to what he loves so deeply.

"I still feel li ke I’m 18,"he says. "Living life the way you do on the road, it definitely keeps you feeling that way. And I think people that have music in their

life are a lot better off (富有) and healthier than people that don’t. I’ve been very content to have not just a little bit of music in my life, but a whole lot of music. It drives my life."

60. Kenny Chesney refers to one of his songs I’m Alive for the purpose of _________.

A. telling his fans about his breakup with his girlfriend

B. inspiring his fans with confidence in life

C. calling on people to make music like him

D. advertising his new album to increase sales

61. We can learn from the passage that Kenny Chesney ______.

A. is a star not only in Nashville, but also around the world

B. won few awards for his work in country music

C. was at his most successful when Greatest Hits II was released

D. selected nothing but big hits for Greatest Hits II

62. What is the relationship between music and life, according to Kenny Chesney

A. Music is a way of earning a lot of money.

B. Music always makes people feel they are 18.

C. Music gives life power, besides wealth and health.

D. Music is the most important part of everyone’s life.

C

Experts have confirmed youngsters who use Face book(美国一社交网站) do worse in exams.

For the study, the researchers quizzed 219 college students about their study habits and the time they spent on Face book. They found that 65 percent of Face book users used the net daily, often checking it several times to see if they had received new messages. The study said that 68 percent of students who used Face book didn’t perform as well as those who did not use the site.

Surfing on Face book can swallow up(耗尽) hours of study time. University student Daisy Jones, 21, said: "I was in the library trying to write a 2,000-word essay when I noticed my Face book habit had gotten out of hand. I couldn’t resist going online. You do that, then someone’s photo catches your eyes. Before you know it, a couple of mi nutes have turned into a couple of hours and you haven’t written a thing."

While they focused on Face book, the findings are also thought to hold true for other social networking sites.

A research by the National Literacy Trust recently showed that one in five youngsters aged seven to 15 never read books outside school because websites and

blogs are becoming their reading matter of choice. Pupils ranked social networking sites, blogs, general websites and magazines above books in a survey of their reading habits. Research has also shown that youngsters are spending up to six hours a day in front of a screen.

However, students appeared to ignore the effect of going online on their study performance. The majority did not feel it had an impact on their work.

A spokesman for Face book said: "There is also research that shows the benefits of services like Face book. It’s in the hands of students, with the help of their parents, to decide how they spend their time."

63. What’s the main idea of this passage

A. study shows pupils who spend time on Face book do worse in exams.

B. People who spend more time on Face book spend less time reading.

C. Websites and blogs are becoming student’s reading matter of choice.

D. The usage of Face book among younger children is high and growing.

64. The third paragraph is developed by ________ in structure.

A. example

B. argument

C. description

D. analysis

65. What’s most students’ attitude towards the result of the study

A. Contrary.

B. Supportive.

C. Understandable.

D. Uninterested.

66. According to Facebook’s spokesman, which of the following is TRUE

A. Face book doesn’t accept the result of the study.

B. The result of the study is good for students.

C. Students are to blame for their poor performance in study.

D. It’s parents who decide whether students should be allowed to use Face book.

D

Guinness World Records, known until 2000 as The Guinness Book of Records(and in previous U.S. editions as The Guinness Book of World Records), is a reference book published annually, and contains an internationally recognized collection of world records —both human achievements and the extremes of the natural world. The book

itself holds a world record, as the best-selling copyrighted series of all time.

However, several world records that were once included in the book have been removed for ethical (伦理的) reasons. By publishing world records in categories(种类), the book encourages people to try to beat that record, and pays no attention to

health and safety. For example, following the publication of a "heaviest cat" record, many cat owners fed their pets beyond the bounds of what was healthy; this is an example of the entries that have been removed. In 1991, the book also dropped records within the "eating and drinking records" category of its Human Achievements section, over concerns that potential competitors would harm themselves, and expose the publisher to litigation(起诉). These changes included the removal of all liquor, wine and beer-drinking records, along with records for eating such unlikely things as bicycles and trees. Other records, such as sword swallowing and rally driving (on public roads), were closed to further entries because the current record holders had performed beyond what were considered acceptable levels of human tolerance.

There have been examples of closed records being reopened, however. For example, the sword-swallowing record was listed as closed in the 1990 Guinness Book of World Records, but the Guinness World Records Primetime TV show, which started in 1998, accepted three sword swallowing challenges (as did the 2007 edition of the Guinness World Records).

Chain letters are also forbidden. According to the book’s publisher: "Guinness World Records does not accept any records relating to chain letters, sent by post or

e-mail. If you receive a letter or an e-mail, which may promise to publish the names

of all those who send it, please destroy or delete it; it is a trick."

67. This passage is mainly about _______.

A. how many kinds of records Guinness World Records has

B. ethical issues and safety concerns related to Guinness World Records

C. the history of Guinness World Records

D. Guinness World Records in overview

68. What is the main purpose of the first paragraph

A. To put forward the main idea of the passage.

B. To tell the readers that the name of the book has changed.

C. To indicate that Guinness World Records is a famous book.

D. To encourage people to read Guinness World Records.

69. Guinness World Records has decided to remove some records because the following BUT

____.

A. the records are too difficult to break

B. the records are considered to involve immoral actions

C. some aspects of trying to break them are dangerous

D. some items are considered beyond acceptable levels of human tolerance

70. From this passage we can infer that ______.

A. sword swallowing will forever be closed to further entry

B. the item about the fattest dog can be found in the present book

C. the editors of Guinness World Records don’t want readers to write to them

D. the record related to rally driving can still be found in the book

第四部分任务型阅读(共10小题；每小题1分,满分10分)

请认真阅读下列短文,并根据所读内容在文章后表格中的空格里填入一个最恰当的单词。注意:每

个空格只填一个单词。请将答案写在答题卡上相应题号的横线上。

Good communication is vital in modern society. We know that much of the communication is unspoken. Consciously or unconsciously, we show our true feelings with our eyes, faces, bodies and attitudes. Your good qualities

can make good communication. The personal qualities include: physical appearance, energy, rate of speech, pitch and tone of voice, gestures, expressiveness of eyes, and the ability to hold the interest of others. What should we do so that our communication will be effective Here are my suggestions.

Firstly, you should be yourself. The trick is to be consistently you, at your best. The most effective people never change character from one situation to another. They’re the same whether they’re having a conversation with their close friends, addressing their garden club or

being interviewed for a job. They communicate with their whole being. Secondly, whether you’re talking to one person or one hundred, always remember to look at them. Don’t break eye contact while talking. As you enter a room, move your eyes comfortably, then look directly at those in

the room and smile. This shows clearly that you are at ease. Smiling is important. The best type of smile and eye contact is gentle and comfortable, not forced.

You should also absorb other people before showing yourself. You can’t learn anything when you talk. When you attend a meeting, a party or an interview, don’t immediately start throwing your opinions. Stop for a second. Absorb what’s going on. What’s the mood of the others—are they down, up, happy, expectant Are they eager to learn from you, or do they

show resistance If you can sense what’s happening with others, you will be better able to reach them. So, listen before you talk.

The fourth suggestion is that you focus your energy. How do you get your energy upBefore the meeting, collect your thoughts about the goal of the meeting—yours and the other’s. Once you go through the doorway, no longer think about yourself. Focus on the person you are meeting to find out what he is interested in.Properly collected energy comes across when we

sincerely believe something. When you speak with energy, you are involved with your audience and your message. You create an air of certainty. The audience may disagree with you, but they can’t question your belief. Lastly, I would like to remind you that you should lighten up. Take a good hard look at your self. Do you say “I” too often Are you only concentrated on your own problems Do you complain frequently If you

第五部分书面表达(满分25分)

假如你是江苏××中学的学生李平,下周是你校的60周年校庆,你和你的同学将要表演相声等节目,你的外教Peter一直对中国的文化艺术很感兴趣,因此你打算邀请他观看你们的演出。请根

据下表内容给Peter写一封邀请信。

目的和主题：为庆祝建校60周年举办联欢会

时间：11月6日上午8：00到11：00

地点：校会议大厅

演出节目：相声、歌曲、舞蹈、武术等

参加人员：全校师生及往界毕业生

注意:

1. 生词: 联欢会party / get-together 周年纪念日anniversary 武术Wushu

2. 词数: 150左右,可适当拓展。

__________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _______________________________________

参考答案

21-25 CCACD 26-30 DABBC 31-35 AAAAA

36-40 DADAB 41-45 BDBCA 46-50 ABABA 51-55 BBBBD

56-60 BCACB 61-65 CCAAA 66-70 ABCAD

任务型阅读:

7 1. effectively/well 72. different 73. smile 74. Force75. talking 76. energy

77. calm 78. relaxed 79. much80. depends

79. regularly 80. rules

书面表达(One possible version):

Dear Peter,

I’m writing to tell you something about our party. To celebrate the sixtieth anniversary of our school’s founding, we will hold a party in the meeting hall of our school on Nov. 6th. That is, next Friday. The party will start at 8:00 a.m. and last till 11:00. At it, a lot of interesting and wonderful performances will be given by us students, such as songs, dances, wushu and poem reciting. My classmates and I will also perform some crosstalk, which, you know, is a traditional Chinese form of comedy. All the teachers and students will come to the party, and so will former graduates from our school.

We have heard that you are interested in Chinese culture and art, so we would like to invite you to watch our performances. We believe you will enjoy our performances very much and have a good time. We will be expecting you at 7:40 that morning.

We are looking forward to seeing you.

Yours,

Li Ping